The first Third Generation Partnership Project (3GPP) Wideband Code Division Multiple Access (Wcdma) networks were launched during 2002. By the end of 2005 there were 100 open Wcdma networks and a total of over 150 operators having frequency licenses for Wcdma operation. Currently, the Wcdma networks are deployedinUniversalMobileTelecommunicationsSystem(UMTS)bandaround2GHz in Europe and Asia including Japan and Korea. Wcdma in America is deployed in the existing 850 and 1900 spectrum allocations while the new 3G band at 1700/2100 is expected to be available in the near future. 3GPP has defined the Wcdma operation also for several additional bands, which are expected to be taken into use during the coming years.
標(biāo)簽： HSDPAHSUPA Access Speed Radio UMTS High for
上傳時(shí)間： 2020-05-27
上傳用戶：shancjb
This research work aims at eliminating the off-chip RF SAW filters from fre- quency division duplexed (FDD) receivers. In the first approach, a monolithic passive RF filter was constructed using on-chip capacitors and bondwire inductors. The bond- wire characteristics were studied in details and the effect of mutual inductive coupling between the bondwires on the filter performance was analyzed. Based on that, a bond- wire configuration was proposed to improve the frequency response of the filter. The filter was implemented in 0.18 μm CMOS process for Wcdma applications.
標(biāo)簽： Interference Mitigation Techniques
上傳時(shí)間： 2020-05-27
上傳用戶：shancjb
The outcome of the 3GPP SAE (system architecture evolution) technical study and specification work is a set of standards that specifies the evolution of the packet core network for GSM/GPRS and Wcdma/HSPA to an all-IP architec- ture and enables a feature-rich ‘common packet core’ for radio accesses devel- oped within 3GPP and also by other standardization fora.
標(biāo)簽： Evolved Packet Core SAE and the
上傳時(shí)間： 2020-06-01
上傳用戶：shancjb
Second-generation telecommunication systems, such as the Global System for Mobile Communications (GSM), enabled voice traffic to go wireless: the number of mobile phones exceeds the number of landline phones and the mobile phone penetration is approaching 100% in several markets. The data-handling capabilities of second-generation systems are limited, however, and third-generation systems are needed to provide the high bit-rate services that enable high-quality images and video to be transmitted and received, and to provide access to the Web with higher data rates.
標(biāo)簽： Evolution Wcdma UMTS HSPA LTE for and
上傳時(shí)間： 2020-06-01
上傳用戶：shancjb
This book is an outgrowth of the pioneering development work done by InterDigital Com- munication Corporation in 3rd Generation TDD Wcdma Technology. Many engineers and managers were involved in this development, which spanned a wide range of tech- nology areas, including system architecture, radio interface, radio modem design, radio resource management and hardware/software implementation. In addition, TDD Wcdma technology had many direct and indirect contributors across the globe in the context of the development of the 3GPP TDD Wcdma Standard.
上傳時(shí)間： 2020-06-01
上傳用戶：shancjb
ML7820+Mini PCI-E LTE 無線模塊是一款適用于 FDD-LTE/TDD-LTE/TD-SCDMA/Wcdma/EDGE/GPRS/GSM 多種網(wǎng)絡(luò)制式的無線產(chǎn)品，采用標(biāo)準(zhǔn) Mini PCI-E 封裝形式，接口成熟。可以提供短信、通訊簿、高速數(shù)據(jù)等多種功能，可廣泛應(yīng)用于移動(dòng)寬帶接入、視頻監(jiān)控、手持終端、車載設(shè)備等產(chǎn)品。
上傳時(shí)間： 2022-03-24
上傳用戶：
AP4000MT模塊是一款插針式4G網(wǎng)絡(luò)模塊，支持2*2貼片卡和外置SIM卡，實(shí)現(xiàn)UART 轉(zhuǎn)LTE雙向透傳功能；支持LTE-FDD、LTE-TDD、Wcdma、GSM通信網(wǎng)絡(luò)，真正實(shí)現(xiàn)廣 覆蓋，長距離，全國漫游，為用戶提供實(shí)時(shí)、穩(wěn)定、透明數(shù)據(jù)傳輸?shù)耐ㄐ啪W(wǎng)絡(luò)。本產(chǎn)品所有 引腳引出，用戶使用更加方便；只需通過簡單的設(shè)置，即可實(shí)現(xiàn)串口到網(wǎng)絡(luò)的雙向數(shù)據(jù)透明 傳輸。
標(biāo)簽： 4G LTE 透傳模塊 ap4000mt
上傳時(shí)間： 2022-06-06
上傳用戶：
PrefaceDuring the past years, there has been a quickly rising interest in radio access technologies for providingmobile as well as nomadic and fixed services for voice, video, and data. The difference indesign, implementation, and use between telecom and datacom technologies is also becoming moreblurred. One example is cellular technologies from the telecom world being used for broadband dataand wireless LAN from the datacom world being used for voice-over IP.Today, the most widespread radio access technology for mobile communication is digital cellular,with the number of users passing 5 billion by 2010, which is more than half of the world’s population.It has emerged from early deployments of an expensive voice service for a few car-borne users,to today’s widespread use of mobile-communication devices that provide a range of mobile servicesand often include camera, MP3 player, and PDA functions. With this widespread use and increasinginterest in mobile communication, a continuing evolution ahead is foreseen.This book describes LTE, developed in 3GPP (Third Generation Partnership Project) and providingtrue 4G broadband mobile access, starting from the first version in release 8 and through the continuingevolution to release 10, the latest version of LTE. Release 10, also known as LTE-Advanced,is of particular interest as it is the major technology approved by the ITU as fulfilling the IMTAdvancedrequirements. The description in this book is based on LTE release 10 and thus provides acomplete description of the LTE-Advanced radio access from the bottom up.Chapter 1 gives the background to LTE and its evolution, looking also at the different standardsbodies and organizations involved in the process of defining 4G. It also gives a discussion of the reasonsand driving forces behind the evolution.Chapters 2–6 provide a deeper insight into some of the technologies that are part of LTE and itsevolution. Because of its generic nature, these chapters can be used as a background not only for LTEas described in this book, but also for readers who want to understand the technology behind othersystems, such as Wcdma/HSPA, WiMAX, and CDMA2000.Chapters 7–17 constitute the main part of the book. As a start, an introductory technical overviewof LTE is given, where the most important technology components are introduced based onthe generic technologies described in previous chapters. The following chapters provide a detaileddescription of the protocol structure, the downlink and uplink transmission schemes, and the associatedmechanisms for scheduling, retransmission and interference handling. Broadcast operation andrelaying are also described. This is followed by a discussion of the spectrum flexibility and the associated
標(biāo)簽： 4g 移動(dòng)通信
上傳時(shí)間： 2022-07-08
上傳用戶：
EC20 R2.1 Mini PCIe 模塊是PCI Express Mini Card 1.2 標(biāo)準(zhǔn)接口LTE 模塊，提供LTE-FDD，LTE-TDD，DC-HSDPA，HSPA+，HSDPA，HSUPA，Wcdma，TD-SCDMA，CDMA，EDGE 和GPRS等多種網(wǎng)絡(luò)制式，支持WinCE/Linux/Android 等嵌入式操作系統(tǒng)。可為客戶應(yīng)用提供語音功能，高速數(shù)據(jù)傳輸和GNSS 功能。
標(biāo)簽： quectel
上傳時(shí)間： 2022-07-11
上傳用戶：
EC20 R2.1是一款帶分集接收功能的 LTE-FDD/LTE-TDD/Wcdma/TD-SCDMA/CDMA/GSM無線通信模塊，支持 LTE-FDD， LTE-TDD， DC-HSDPA， HSPA+， HSDPA， HSUPA， Wcdma， TD-SCDMA，CDMA， EDGE 和 GPRS 網(wǎng)絡(luò)數(shù)據(jù)連接，可為客戶特殊應(yīng)用提供 GNSS和語音功能移遠(yuǎn)的Quectel_EC20_R2.1_硬件設(shè)計(jì)手冊(cè)，介紹了EC20硬件設(shè)計(jì)相關(guān)的信息。包括EC20模塊使用時(shí)的外圍硬件電路設(shè)計(jì)。尤其是EC20的電源和串口電平電路，值得借鑒。
標(biāo)簽： quectel 硬件設(shè)計(jì)
上傳時(shí)間： 2022-07-27
上傳用戶：xsr1983
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